Abstract
In a spintronic resonator a radio-frequency signal excites spin dynamics that can be detected by the spin-diode effect. Such resonators are generally based on ferromagnetic metals and their responses to spin torques. New and richer functionalities can potentially be achieved with quantum materials, specifically with transition metal oxides that have phase transitions that can endow a spintronic resonator with hysteresis and memory. Here we present the spin torque ferromagnetic resonance characteristics of a hybrid metal-insulator-transition oxide/ ferromagnetic metal nanoconstriction. Our samples incorporate {mathrm {V}}_2{mathrm {O}}_3, with Ni, Permalloy ({hbox {Ni}}_{80}{hbox {Fe}}_{20}) and Pt layers patterned into a nanoconstriction geometry. The first order phase transition in {mathrm {V}}_2{mathrm {O}}_3 is shown to lead to systematic changes in the resonance response and hysteretic current control of the ferromagnetic resonance frequency. Further, the output signal can be systematically varied by locally changing the state of the {mathrm {V}}_2{mathrm {O}}_3 with a dc current. These results demonstrate new spintronic resonator functionalities of interest for neuromorphic computing.
Highlights
In this article we show that several new spintronic resonator functionalities emerge in nanoconstrictions formed from a ferromagnet/V2O3 heterostructure, a structure we denote a quantum material spintronic resonator (QM-SR)
These results highlight the unique characteristics of QM-SRs: their response depends on their prior history, i.e. they have memory of their prior state
These results highlight new spintronic functionalities that can be achieved by coupling of a transition metal oxide and metallic ferromagnets in a nanoconstriction geometry
Summary
To characterize the response of the nanoconstriction we conduct spin-transfer ferromagnetic resonance (STFMR) experiments, as described in the Methods section. The first order phase transition in V2O3 leads to a hysteretic nanoconstriction response These results highlight the unique characteristics of QM-SRs: their response depends on their prior history, i.e. they have memory of their prior state. This suggests the coexistence of metallic and insulating V2O3 regions in the nanoconstriction region[23], with two different strain states and resonance fields, as reported in[5]
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